Yes, I do have a physician, although she is not involved in any intentional gender treatment of me. The guidelines from the National Center for Transgender Equality indicate that it can be "a licensed physician with whom you have a doctor-patient relationship and who is familiar with your transition-related treatment. This may be any physician who is familiar with your treatment, including a primary care physician or specialist." The guidelines go on to say that the doctor can be one who has treated you or who has reviewed and evaluated your medical history.
Since I do not wish to involve either medicare nor my insurance company in my personal affairs more than they need to be, I would prefer to find an outside specialist who would review and evaluate my medical history.
Hugs,
Persephone.